<template>
  <el-breadcrumb class="app-breadcrumb" separator="/">
    <transition-group name="breadcrumb">
      <el-breadcrumb-item v-for="(item,index) in state.levelList" :key="item.path">
        <span v-if="item.redirect==='noRedirect'||index==state.levelList.length-1" class="no-redirect">{{ item.meta.title }}</span>
        <a v-else @click.prevent="handleLink(item)">{{ item.meta.title }}</a>
      </el-breadcrumb-item>
    </transition-group>
  </el-breadcrumb>
</template>

<script setup>
import { reactive, onMounted, watch } from 'vue'
import { useRouter, useRoute } from 'vue-router'
// import pathToRegexp from 'path-to-regexp'

const route = useRoute()
const router = useRouter()

const state = reactive({ levelList: [] })

// const pathCompile = path => {
//   // To solve this problem https://github.com/PanJiaChen/vue-element-admin/issues/561
//   const { params } = route
//   const toPath = pathToRegexp.compile(path)
//   return toPath(params)
// }
const handleLink = item => {
  const { redirect, path } = item
  if (redirect) {
    router.push(redirect)
    return
  }
  // router.push(pathCompile(path))
  router.push(path)
}
const isDashboard = route => {
  const name = route && route.name
  if (!name) {
    return false
  }
  return name.trim().toLocaleLowerCase() === 'Dashboard'.toLocaleLowerCase()
}
const getBreadcrumb = () => {
  // only show routes with meta.title
  let matched = route.matched.filter(item => item.meta && item.meta.title)
  const first = matched[0]

  if (!isDashboard(first)) {
    matched = [{ path: '/index', meta: { title: '首页' }}].concat(matched)
  }
  state.levelList = matched.filter(item => item.meta && item.meta.title && item.meta.breadcrumb !== false)
}

onMounted(() => {
  getBreadcrumb()
})

watch(() => route, getBreadcrumb, { deep: true })
</script>

<style lang="scss" scoped>
.app-breadcrumb.el-breadcrumb {
  display: inline-block;
  font-size: 14px;
  line-height: 50px;
  margin-left: 8px;

  .no-redirect {
    color: #97a8be;
    cursor: text;
  }
}
</style>
